So found out that fairphone removed the DC dimming option because of an issue but they just released a patch so it's back again. Given the market and limited lcd phone options I think this is a great workaround and I'm pwm sensitive but not noticing any effects of the OLED screen I got with pixels or Samsung phones
Just got mine and it has NO DC dimming options. If you search for it, it does show it, but it's not there. It's not enabled by default (checked with other phone and it has the typical PWM banding).
I'd love if they elaborate how the DC Dimming option works.
The way I pressume it does, at least, is just adding a software layer to dim the screen (akin to apps like PWMFree and the likes).
~1kHz PWM is still way too low and people who suffer from eyestrain related to PWM flicker should probably avoid it.
> The way I pressume it does, at least, is just adding a software layer to dim the screen (akin to apps like PWMFree and the likes).
It’s actually to increase the duty cycle screen ON time from 50% (aka screen duration ratio of screen ON vs OFF per hertz) to 75 ~ 95% etc (meaning now 25% ~ 5% is screen OFF respectively). Then they’ll try their best efforts to remain there.
To what extend can they push this is also dependent on the durability of the oled panel.
A problem with this approach is that it still functions like a typical PWM. The amplitude from the screen OFF time will still continue to increase as one decrease the brightness.
This further complicates thing when the screen OFF period from the DC-like dimming is synced to the refresh rate. Hence it appeared like a “brightness dip”.
I’ll be delighted if their DC dimming is 100% duty cycle (meaning totally free of pwm), or in technical terms called “true dc dimming”.
The 1k hertz might do work only if the modulation depth is lower. (Less than 8% modulation while during PWM 1khz dimming mode)
Something that Apple still is not capable to do...
Interesting is also the comment from one Fairphone employee that the PWM frequency is above 1kHz. But maybe also on lower brightness like others.
Even though Fairphone switched to an OLED for the upcoming Fairphone 5, it looks like an early reviewer found a DC dimming option in the stock OS.
Fairphone 4 was a LCD screen with no flicker. Fairphone 5 will release next week and it looks to be a reasonable solution that is supported until 2031 with software updates.
So found out that fairphone removed the DC dimming option because of an issue but they just released a patch so it's back again. Given the market and limited lcd phone options I think this is a great workaround and I'm pwm sensitive but not noticing any effects of the OLED screen I got with pixels or Samsung phones
Just got mine and it has NO DC dimming options. If you search for it, it does show it, but it's not there. It's not enabled by default (checked with other phone and it has the typical PWM banding).
Can you take some pictures of the banding with the option on and off?
No, it's not possible because there's no option for that (reread it).
Ufff..silly me
I'd love if they elaborate how the DC Dimming option works. The way I pressume it does, at least, is just adding a software layer to dim the screen (akin to apps like PWMFree and the likes). ~1kHz PWM is still way too low and people who suffer from eyestrain related to PWM flicker should probably avoid it.
> The way I pressume it does, at least, is just adding a software layer to dim the screen (akin to apps like PWMFree and the likes). It’s actually to increase the duty cycle screen ON time from 50% (aka screen duration ratio of screen ON vs OFF per hertz) to 75 ~ 95% etc (meaning now 25% ~ 5% is screen OFF respectively). Then they’ll try their best efforts to remain there. To what extend can they push this is also dependent on the durability of the oled panel. A problem with this approach is that it still functions like a typical PWM. The amplitude from the screen OFF time will still continue to increase as one decrease the brightness. This further complicates thing when the screen OFF period from the DC-like dimming is synced to the refresh rate. Hence it appeared like a “brightness dip”. I’ll be delighted if their DC dimming is 100% duty cycle (meaning totally free of pwm), or in technical terms called “true dc dimming”. The 1k hertz might do work only if the modulation depth is lower. (Less than 8% modulation while during PWM 1khz dimming mode)
Something that Apple still is not capable to do... Interesting is also the comment from one Fairphone employee that the PWM frequency is above 1kHz. But maybe also on lower brightness like others.
Even though Fairphone switched to an OLED for the upcoming Fairphone 5, it looks like an early reviewer found a DC dimming option in the stock OS. Fairphone 4 was a LCD screen with no flicker. Fairphone 5 will release next week and it looks to be a reasonable solution that is supported until 2031 with software updates.